1 // -----------------------------------------------------------------------
2 // Copyright (C) 2006 - 2007 FRESCOR consortium partners:
4 // Universidad de Cantabria, SPAIN
5 // University of York, UK
6 // Scuola Superiore Sant'Anna, ITALY
7 // Kaiserslautern University, GERMANY
8 // Univ. Politecnica Valencia, SPAIN
9 // Czech Technical University in Prague, CZECH REPUBLIC
11 // Thales Communication S.A. FRANCE
12 // Visual Tools S.A. SPAIN
13 // Rapita Systems Ltd UK
16 // See http://www.frescor.org for a link to partners' websites
18 // FRESCOR project (FP6/2005/IST/5-034026) is funded
19 // in part by the European Union Sixth Framework Programme
20 // The European Union is not liable of any use that may be
23 // This file is part of the FRSH implementation
25 // FRSH is free software; you can redistribute it and/or modify
26 // it under the terms of the GNU General Public License as published by
27 // the Free Software Foundation; either version 2, or (at your option)
30 // FRSH is distributed in the hope that it will be useful, but
31 // WITHOUT ANY WARRANTY; without even the implied warranty of
32 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
33 // General Public License for more details.
35 // You should have received a copy of the GNU General Public License
36 // distributed with FRSH; see file COPYING. If not, write to the
37 // Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
40 // As a special exception, if you include this header file into source
41 // files to be compiled, this header file does not by itself cause
42 // the resulting executable to be covered by the GNU General Public
43 // License. This exception does not however invalidate any other
44 // reasons why the executable file might be covered by the GNU General
46 // -----------------------------------------------------------------------
47 //fosa_clocks_and_timers.h
48 //==============================================
49 // ******** ****** ******** **********
50 // **///// /** ** **////// /** /**
51 // ** /** ** /** /** /**
52 // ******* /** ** /********* /**********
53 // **//// /** ** ////////** /**//////**
54 // ** /** ** /** /** /**
55 // ** /** ** ******** /** /**
56 // // /******/ //////// // //
58 // FOSA(Frescor Operating System Adaptation layer)
59 //================================================
62 #ifndef FOSA_CLOCKS_AND_TIMERS_H_
63 #define FOSA_CLOCKS_AND_TIMERS_H_
65 #include "fosa_types.h"
66 #include "fosa_configuration_parameters.h"
69 * @defgroup clocksandtimers Clocks and Timers
72 * This module defines the types and functions to abstract clocks and
73 * timers for the FRSH implementation.
80 /*************************
82 *************************/
87 * Get the time from a clock
89 * This function sets the variable pointed to by current_time to the
90 * current value of the clock specified by clockid, which may be the
91 * FOSA_CLOCK_REALTIME constant or a value obtained with
92 * fosa_get_cputime_clock()
94 * Returns 0 if successful; otherwise it returns an error code:
95 * EINVAL: the value of clockid is invalid
97 * Alternatively, in case of error the implementation is allowed to
98 * notify it to the system console and then terminate the FRSH
99 * implementation and dependant applications
101 int fosa_clock_get_time(fosa_clock_id_t clockid, struct timespec *current_time);
105 * fosa_get_cputime_clock()
107 * Get the identifier of a cpu-time clock
109 * This function stores in the variable pointed to by clockid the
110 * identifier of a cpu-time clock for the thread specified by tid.
112 * Returns 0 if successful; otherwise it returns an error code:
113 * EINVAL: the value of tid is invalid
115 * Alternatively, in case of error the implementation is allowed to
116 * notify it to the system console and then terminate the FRSH
117 * implementation and dependant applications
119 int fosa_thread_get_cputime_clock(frsh_thread_id_t tid, fosa_clock_id_t *clockid);
122 /*************************
124 *************************/
127 * fosa_timer_create()
129 * Create a one-shot timer
131 * This function creates a timer based on the clock specified by clock,
132 * and associates to this timer a notification mechanism consisting of
133 * a signal and associated information. Initially, the timer is in the
134 * disarmed state, i.e., not counting time. It can be armed to start
135 * counting time with fosa_timer_arm().
137 * The function stores the identifier of the newly created timer in the
138 * variable pointed to by timerid.
140 * When the timer expires, the signal number specified by signal will be
141 * sent together with the information specified by info, to the thread
142 * that armed the timer (@see fosa_timer_arm()).
144 * In those implementations that do not support queueing a
145 * signal with information to a thread (such as POSIX), the signal may
146 * be sent to any thread that is waiting for this signal via
147 * fosa_signal_wait(). Portability can be ensured by having the receiver
148 * thread be the one who is waiting for the signal.
150 * Returns 0 if successful; otherwise it returns an error code:
151 * EINVAL: the value of clockid or signal is invalid
153 * EAGAIN: the system lacks enough resources to create the timer
155 * Alternatively, in case of error the implementation is allowed to
156 * notify it to the system console and then terminate the FRSH
157 * implementation and dependant applications
159 int fosa_timer_create
160 (fosa_clock_id_t clockid, frsh_signal_t signal, frsh_signal_info_t info,
161 fosa_timer_id_t *timerid);
164 * fosa_timer_delete()
168 * The function deletes the timer specified by timerid, which becomes
169 * unusable. If the timer was armed, it is automatically disarmed before
172 * Returns 0 if successful; otherwise it returns an error code:
173 * EINVAL: the value of timerid is not valid
175 * Alternatively, in case of error the implementation is allowed to
176 * notify it to the system console and then terminate the FRSH
177 * implementation and dependant applications
179 int fosa_timer_delete(fosa_timer_id_t timerid);
186 * The timer specified by timer is armed and starts counting time.
188 * If abstime is true, the value pointed to by value is the absolute
189 * time at which the timer will expire. If value specifies a time instant
190 * in the past, the timer expires immediately.
192 * If abstime is false, the value pointed to by value is the relative interval
193 * that must elapse for the timer to expire.
195 * In both cases, absolute or relative, the time is measured with the clock
196 * associated with the timer when it was created.
198 * If the timer was already armed, the previous time or interval is discarded
199 * and the timer is rearmed with the new value.
201 * When the timer expires, it is disarmed.
203 * Returns 0 if successful; otherwise it returns an error code:
204 * EINVAL: the value of timerid or value is invalid
206 * Alternatively, in case of error the implementation is allowed to
207 * notify it to the system console and then terminate the FRSH
208 * implementation and dependant applications
211 (fosa_timer_id_t timerid, bool abstime,
212 const struct timespec *value);
215 * fosa_timer_get_remaining_time()
217 * Get the remaining time for timer expiration
219 * Returns the relative remaining time for timer expiration. If the
220 * clock is a CPU clock it returns the time as if the thread was
221 * executing constantly.
223 * If the timer is disarmed it returns 0.
225 * Returns 0 if successful; otherwise it returns an error code:
226 * EINVAL: the value of timerid or value is invalid
228 * Alternatively, in case of error the implementation is allowed to
229 * notify it to the system console and then terminate the FRSH
230 * implementation and dependant applications
232 int fosa_timer_get_remaining_time
233 (fosa_timer_id_t timerid, struct timespec *remaining_time);
239 * fosa_timer_disarm()
241 * Disarm a timer and optionally obtain remaining time before expiration
243 * The timer specified by timer is disarmed, and will not expire unless
244 * it is rearmed. If the timer was already disramed, the function has
247 * If the pointer remaining_time is != NULL, the remaining time before
248 * expiration will be returned in that pointer. If the timer was
249 * disarmed a 0 value will be set.
251 * Returns 0 if successful; otherwise it returns an error code:
252 * EINVAL: the value of timerid or value is invalid
254 * Alternatively, in case of error the implementation is allowed to
255 * notify it to the system console and then terminate the FRSH
256 * implementation and dependant applications
258 int fosa_timer_disarm(fosa_timer_id_t timerid, struct timespec
265 #endif /* !FOSA_CLOCKS_AND_TIMERS_H_ */